Question

b) 9/5.x=18/25

e)x-20%.x=2,5

Answer 1

\(b)\frac{9}{5}.x=\frac{18}{25}\)

\(\Rightarrow x=\frac{18}{25}\div\frac{9}{5}=\frac{18}{25}.\frac{5}{9}\)

\(\Rightarrow x=\frac{2}{5}\)

Answer 2

\(e)x-20\%.x=2,5\)

\(\Rightarrow x.\left(1-\frac{1}{5}\right)=\frac{5}{2}\)

\(\Rightarrow x.\frac{4}{5}=\frac{5}{2}\)

\(\Rightarrow x=\frac{5}{2}\div\frac{4}{5}=\frac{25}{8}\)

Answer 3

b) \(\frac{9}{5}\). x = \(\frac{18}{25}\)

               x = \(\frac{18}{25}\): \(\frac{9}{5}\)

               x = \(\frac{2}{5}\)

e) x - 20% . x = 2,5

1 . x - \(\frac{1}{5}\). x = \(\frac{5}{2}\)

x . ( 1- \(\frac{1}{5}\)) = \(\frac{5}{2}\)

x . \(\frac{4}{5}\)= \(\frac{5}{2}\)

x = \(\frac{5}{2}\): \(\frac{4}{5}\)

x = \(\frac{25}{8}\)

=^_^=

h mình nha

Answer 4

b)\(\frac{9}{5}.x=\frac{18}{25}\)

\(x=\frac{18}{25}:\frac{9}{5}\)

\(x=\frac{18}{25}.\frac{5}{9}\)

\(x=\frac{2}{5}\)

c)\(x-20\%.x=2,5\)

\(x-\frac{1}{5}.x=\frac{2}{5}\)

\(x.\left(1-\frac{1}{5}\right)=\frac{2}{5}\)

\(x.\frac{4}{5}=\frac{2}{5}\)

\(x=\frac{2}{5}:\frac{4}{5}\)

\(x=\frac{2}{5}.\frac{5}{4}\)

\(x=\frac{1}{2}\)